EP0802528A2 - Appareil d'enregistrement et de reproduction compatible - Google Patents

Appareil d'enregistrement et de reproduction compatible Download PDF

Info

Publication number
EP0802528A2
EP0802528A2 EP97105764A EP97105764A EP0802528A2 EP 0802528 A2 EP0802528 A2 EP 0802528A2 EP 97105764 A EP97105764 A EP 97105764A EP 97105764 A EP97105764 A EP 97105764A EP 0802528 A2 EP0802528 A2 EP 0802528A2
Authority
EP
European Patent Office
Prior art keywords
track
track spacing
spacing
scanning
recording
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97105764A
Other languages
German (de)
English (en)
Other versions
EP0802528A3 (fr
EP0802528B1 (fr
Inventor
Lieu Kim Dang
Christian Büchler
Heinz Jörg Schroeder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Licensing SAS
Original Assignee
Deutsche Thomson Brandt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0802528A2 publication Critical patent/EP0802528A2/fr
Publication of EP0802528A3 publication Critical patent/EP0802528A3/fr
Application granted granted Critical
Publication of EP0802528B1 publication Critical patent/EP0802528B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903—Multi-beam tracking systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B2007/00709—Dimensions of grooves or tracks, e.g. groove depth, track pitch
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B2007/00754—Track shape, e.g. address or synchronisation information in wobbled track or sidewall

Definitions

  • the invention relates to a compatible recording or reproducing device with three-point scanning for recording media having different track spacing.
  • Optical and magnetic recording media which have different track spacings are generally known. Record carriers with a smaller track spacing are usually of a newer generation and generally enable the recording or reproduction of larger amounts of information or data. In order to be able to continue to use older generation recording media with larger track spacing in recording or playback devices of newer generation for recording media with smaller track spacing, these recording or playback devices must be compatible with the different recording media. It is desirable, for example, in a recording or playback device for optical recording media having a high storage density, a so-called SD, which also is called a S uper D ensity disc, also to be able to play CDs. The SD has a higher storage density than the CD, which is achieved, among other things, by a smaller track spacing.
  • a compatible tracking system is required. Due to the higher track density or the smaller track spacing in the SD, the tracking of the SD with a generally known three-beam system is more critical than with a CD. In a compatible recording or reproducing device which enables both a CD and an SD to be played back with the same optical scanning system, the three-beam tracking must therefore be set in such a way that it is optimal for the SD. This means that the beams provided for tracking, which are also referred to as auxiliary beams E and F of the optical system, must be adjusted in such a way that they affect the SD track on both sides.
  • the three-point scanning system is set in such a way that the scanning centers have a lateral spacing from one another which is approximately both an integer multiple of a quarter of the track spacing and a common multiple of the different track spacing.
  • the distance between the scanning centers for a compatible recording and reproducing device for SD and CD is selected such that it is approximately 7/4 of the track spacing of the recording medium with the smaller track spacing and approximately 3/4 of the track spacing of the recording medium with the larger track spacing.
  • the record carrier with the smaller track spacing is the SD and the record carrier with the larger track spacing is the CD.
  • the application of the invention is not restricted to recording media having spiral data or information tracks.
  • the data or Information tracks on the record carrier can also be parallel tracks.
  • the invention is not limited to optical recording media such as the SD and CD, but can equally be used for recording media in connection with multi-track recording and different track spacings.
  • a first record carrier SD has a first track pitch P1 and a second record carrier CD has a track pitch P2.
  • the first recording medium SD has a comparatively smaller track spacing P1 of 0.74 ⁇ m.
  • a three-point scanning is used for tracking, the is also referred to as three-beam guidance.
  • the three-beam tracking uses the effect that on average the intensity of the light reflected by the recording medium increases when the light beam follows a path between the tracks. The greatest modulation and lowest average intensity is achieved in a path that follows the exact center of the track.
  • the light reflected by the recording medium SD, CD has the greatest intensity if the light beam is guided exactly between two tracks on a path.
  • a tracking error signal is derived from the two outer rays, which are also referred to as auxiliary light spots E, F.
  • the auxiliary beams E, F are at the same distance from the main beam M, leading and lagging, and are generated with an optical grating.
  • the auxiliary beams E and F should be adjusted so that when the auxiliary beam E reaches the center of the track, the other auxiliary beam F is in the middle between the tracks.
  • the phase shift of the average signal is 180 °. Average here means that a time constant is used in such a way that the tangential pits are no longer resolved, but the intensity modulation can still be detected in the radial direction because the track has been crossed.
  • the phase difference between auxiliary beams E and F fluctuates slightly when a disk is completely off the disk Is reproduced inside to the outside.
  • the phase difference is greater, the greater the tangential angle ⁇ shown in FIG. 1 between a straight line connecting the center points of the auxiliary beams E, F and the track direction T.
  • the slightest changes in the phase position are achieved when the tangential angle ⁇ is small. This is particularly the case when all three beams touch the same track.
  • the diagram shown in Fig. 3 shows the intensity of the signal from the auxiliary beams E and F in the event that the tangential angle ⁇ has a value at which the phase shift between the two signals is 180 °.
  • the tracking error signal corresponds to the difference between the signals provided by the auxiliary beams E and F and has a course similar to a sine curve.
  • the unit of measurement for the intensity I was chosen arbitrarily and on the abscissa axis, track deviations O to the right and left of the track are shown as parts of the track spacing. It can be seen that the difference between the signals formed by the auxiliary beams E, F leads to an error signal with a comparatively greater intensity due to the phase shift of 180 °.
  • the auxiliary beams E, F for different recording media SD, CD are arranged at a different lateral distance from one another.
  • This distance is equal to the distance between the scanning center points of the auxiliary beams E, F to the center of the track, provided that the central scanning point is exactly on the track.
  • a CD which has a track spacing P2 1.6 ⁇ m
  • there is an optimal distance between the scanning centers of the auxiliary beams E, F and P2 / 4 0.4 ⁇ m.
  • a tangential angle ⁇ between a straight line connecting the center points of the auxiliary tracks E and F and the track direction T depends on the type of recording medium CD or SD or their track distance P1, P2.
  • the grid G generating the auxiliary beams E and F would consequently have to be set according to the respective type of the recording medium SD, CD or the track spacings P1, P2.
  • the light spots or scanning beams are formed with the light beam of a laser LD, which is divided with the grating G into a central scanning beam and secondary beams +/- first order.
  • the secondary beams form the auxiliary beams E, F.
  • the light beam consisting of the central scanning beam and the auxiliary beams E, F passes through a colimator C, strikes a semitransparent mirror, from which it is directed onto a deflecting mirror which directs the light beam through an objective lens OL directs to the recording medium D.
  • the central scanning beam and the auxiliary beams are imaged on the recording medium D as scanning points by means of this optical device.
  • the tangential angle ⁇ between the track direction and the auxiliary beams E, F is set with the grating G.
  • the light reflected by the recording medium also passes through the objective lens OL and is directed via the deflection mirror DM, through the semitransparent mirror HP, a focus lens FL and a cylindrical lens CL onto a photodetector PD.
  • the sampling points for generating the information signal and for generating focus and tracking error signals are imaged on the photodetector PD. This means that if the tangential angle ⁇ were changed with the grating G, the photodetector PD would also have to be readjusted accordingly or additional photo elements would have to be provided. In a compatible recording or playback device, however, it seems to be almost impossible to make such settings automatically in accordance with the type of recording medium SD, CD, since the setting has to be carried out very precisely and with high long-term stability and reproducibility.
  • the scanning points of the auxiliary beams E, F of the scanning system for a recording medium SD having the smallest track spacing are preferably set in a first method step such that they have a maximum correlation with the central scanning point.
  • the tangential angle ⁇ is then increased until the phase shift between the signals formed by auxiliary beams E, F has risen to 2 ⁇ (360 ° + 180 °).
  • the tangential angle ⁇ is initially for the recording medium CD with the larger track spacing is set and then fine adjustment is made for the recording medium SD with the smaller track spacing.
  • a recording medium SD with the smallest track spacing is used to set the tangential angle ⁇ , but in which only every second track is designed as an information track.

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
EP97105764A 1996-04-17 1997-04-08 Appareil d'enregistrement et de reproduction compatible Expired - Lifetime EP0802528B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19614970 1996-04-17
DE19614970A DE19614970A1 (de) 1996-04-17 1996-04-17 Kompatibles Aufzeichnungs- oder Wiedergabegerät

Publications (3)

Publication Number Publication Date
EP0802528A2 true EP0802528A2 (fr) 1997-10-22
EP0802528A3 EP0802528A3 (fr) 1997-12-10
EP0802528B1 EP0802528B1 (fr) 2009-11-18

Family

ID=7791407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97105764A Expired - Lifetime EP0802528B1 (fr) 1996-04-17 1997-04-08 Appareil d'enregistrement et de reproduction compatible

Country Status (9)

Country Link
US (1) US6219316B1 (fr)
EP (1) EP0802528B1 (fr)
JP (1) JPH1040559A (fr)
KR (1) KR100563008B1 (fr)
CN (1) CN1111849C (fr)
DE (2) DE19614970A1 (fr)
ID (1) ID16635A (fr)
MY (1) MY119278A (fr)
SG (1) SG52953A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004281026A (ja) * 2002-08-23 2004-10-07 Matsushita Electric Ind Co Ltd 光ピックアップヘッド装置及び光情報装置及び光情報再生方法
TWI254297B (en) 2003-05-21 2006-05-01 Samsung Electronics Co Ltd Method and system for forming main and side beams of light for multiple disc formats
KR100510529B1 (ko) * 2003-05-21 2005-08-26 삼성전자주식회사 호환 가능한 트랙킹 제어 방법, 광픽업 및 광기록 및/또는재생 장치
WO2006030348A1 (fr) * 2004-09-15 2006-03-23 Arima Devices Corporation Dispositif optique compatible avec deux types de disques
JP4234109B2 (ja) * 2004-10-18 2009-03-04 株式会社リコー 光ピックアップ装置とこれを用いる情報記録装置
TW200744088A (en) * 2006-05-18 2007-12-01 Koninkl Philips Electronics Nv A method and apparatus for controlling a plurality of laser spots to write/read data on/from an optical disc

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5374403A (en) * 1976-12-15 1978-07-01 Toshiba Corp Optical imformation recorder
US4290122A (en) * 1979-05-14 1981-09-15 Xerox Corporation Self-synchronizing clock source for optical memories
US4449215A (en) * 1982-03-24 1984-05-15 Rca Corporation Apparatus for varying track spacing in multi-track optical record systems
DE3323007C1 (de) * 1983-06-25 1984-06-28 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Spurfolgesystem mit einem optischen Abtaster für ein Audio- oder Video-Plattenwiedergabegerät
US4737946A (en) * 1984-09-03 1988-04-12 Omron Tateisi Electronics Co. Device for processing optical data with improved optical allignment means
DE3533647C2 (de) * 1984-09-20 1994-09-01 Pioneer Electronic Corp Optisches Informationsaufzeichnungs- und Wiedergabegerät
JPH01269240A (ja) * 1988-04-20 1989-10-26 Csk Corp 光記録装置
JP2684763B2 (ja) * 1989-04-24 1997-12-03 ソニー株式会社 光学記録および／または再生装置
JP2870127B2 (ja) * 1990-05-31 1999-03-10 ソニー株式会社 トラッキング制御方法
TW213519B (fr) * 1991-08-01 1993-09-21 Philips Nv
JPH05234107A (ja) * 1992-02-18 1993-09-10 Sony Corp 光学ピックアップ装置及びトラッキング誤差信号検出方法
JP2934684B2 (ja) * 1993-09-10 1999-08-16 株式会社日本コンラックス 光学式情報記録再生システム及び該システムにおけるトラッキング制御装置
JPH07105549A (ja) * 1993-09-30 1995-04-21 Canon Inc 光学的情報記録再生方法及び光学的情報記録再生装置
JP3410869B2 (ja) * 1995-04-11 2003-05-26 株式会社リコー 光ピックアップ装置
DE19514881A1 (de) * 1995-04-22 1996-10-24 Thomson Brandt Gmbh Kompatibles Aufzeichnungs- und/oder Wiedergabegerät
JPH08329490A (ja) * 1995-05-31 1996-12-13 Pioneer Electron Corp トラッキングエラー信号生成装置

Also Published As

Publication number Publication date
SG52953A1 (en) 1998-09-28
CN1167973A (zh) 1997-12-17
KR100563008B1 (ko) 2006-06-20
ID16635A (id) 1997-10-23
JPH1040559A (ja) 1998-02-13
US6219316B1 (en) 2001-04-17
MY119278A (en) 2005-04-30
DE59713019D1 (de) 2009-12-31
KR970071559A (ko) 1997-11-07
EP0802528A3 (fr) 1997-12-10
CN1111849C (zh) 2003-06-18
EP0802528B1 (fr) 2009-11-18
DE19614970A1 (de) 1997-10-23

Similar Documents

Publication Publication Date Title
DE3136090C2 (fr)
DE68924303T2 (de) Optische Kopfanordnung.
DE69218070T2 (de) Optisches Aufzeichnungs- und Wiedergabegerät zur Nachsteuerung mit gewobbelten Führungsspuren
DE3414052C2 (de) Spurführungs-Servoschaltung für optische Abtastgeräte
DE69219735T2 (de) Optische Abtasteinrichtung und Fokusservoeinrichtung dafür
DE3687274T2 (de) Spurnachlaufverfahren fuer optische speicherplatte.
DE3686589T2 (de) Spurfolgesystem zum steuerbaren projizieren eines optischen strahles auf eine optische platte.
DE69609902T2 (de) Optische Abtastvorrichtung
DE69012945T2 (de) Optische aufzeichnungs- und/oder -wiedergabegerät.
DE3618720C2 (fr)
DE69324858T2 (de) Optisches aufzeichnungsmedium, aufzeichnungsmethode dafür, wiedergabemethode dafür und methode zur erzeugung eines spurfolgefehlersignals
DE3784644T2 (de) Gerät zum Aufzeichnen und Wiedergeben einer optischen Platte mit herabgesetzter Nullpunktsabweichung in ihrem Spurverfolgungsfehlersignal.
DE69320841T2 (de) Gerät zur Aufzeichnung und Wiedergabe von optischen Informationen
DE69713316T4 (de) Servobetrieb für spurverfolgung mit geschlossener regelschleife
DE69216318T2 (de) Kompatible optische Abtastvorrichtung
DE3132804A1 (de) Verfahren zum erfassen eines fokussierzustandes eines objektivs zur abtastung von videoplatten und vorrichtung zur durchfuehrung dieses verfahrens
DE69728313T2 (de) Multifokale Linse, multifokale optische Abtastvorrichtung und optisches Informationswiedergabegerät
DE3888915T2 (de) Verfahren und Einrichtung zur Informationsaufzeichnung und -wiedergabe.
DE10062078A1 (de) Verfahren zum Erzeugen eines Linsenpositionssignals sowie entsprechendes Gerät zum Lesen und/oder Beschreiben eines optischen Aufzeichnungsträgers
DE69701552T2 (de) Optische Abtastvorrichtung mit optischer Phasenplatte
DE3501609C2 (fr)
EP0802528B1 (fr) Appareil d'enregistrement et de reproduction compatible
DE69015675T2 (de) Gerät zur optischen Aufzeichnung und Wiedergabe.
DE69727101T2 (de) Verfahren zur Herstellung einer optischen Platte
DE69322730T2 (de) Verfahren und Vorrichtung zur optischen Aufzeichnung und/oder Wiedergabe von Information

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19980529

17Q First examination report despatched

Effective date: 20010803

17Q First examination report despatched

Effective date: 20010803

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON LICENSING, S.A.

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON LICENSING

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 59713019

Country of ref document: DE

Date of ref document: 20091231

Kind code of ref document: P

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: THOMSON LICENSING

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20100819

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100408

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20101230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100408

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20091118

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100430